3. Combine 5 cups water and lentils in a medium saucepan; bring to a boil. Cover, reduce heat, and simmer 30 minutes or until lentils are tender. Remove from heat; add vermicelli, stirring well to combine. Wrap a clean kitchen towel around lid, and cover lentil mixture; let stand for 10 minutes or until vermicelli is tender. Add rice and 1 teaspoon salt to lentil mixture; fluff with a fork. Serve immediately with sauce and onions.